linux-kernel - Re: [PATCH] add new NRP power meter USB device driver

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Date:	Thu, 31 May 2012 20:04:11 +0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Oliver Neukum <oneukum@...e.de>
Cc:	Stefani Seibold <stefani@...bold.net>,
	linux-kernel@...r.kernel.org,
	thomas.braunstorfinger@...de-schwarz.com
Subject: Re: [PATCH] add new NRP power meter USB device driver

On Thu, May 31, 2012 at 12:17:11PM +0200, Oliver Neukum wrote:
> Am Donnerstag, 31. Mai 2012, 11:53:04 schrieb Greg KH:
> > > So it is a chicken and egg problem. A lot of software is now out with
> > > depends on this driver and a lot of embedded development environments
> > > doesn't provide libudev, libsysfs und libusb. It will also increase the
> > > size of the image and adds additional dependencies to the application.
> > 
> > You don't need any of those libraries to do this.  What's wrong with
> > using "raw" usbfs interactions?
> 
> SPI is not limited to USB. If we can get a unified subsystem then the
> drivers need to be in kernel space, as some hardware does not allow
> a solution in user space.

Ok, now that is a valid reason for a kernel driver.

But, I think it should use the IIO interface, as that should handle
these types of devices.

thanks,

greg k-h
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